Zilog Z8F0130 - Manual (Page 54)

eZ8
™
CPU Core
User Manual
UM012820-0810 Addressing Modes
32
Indirect Register Addressing
In Indirect Register Addressing Mode, symbol IR, the contents of the
specified Register provide an address as displayed in
Figure 11 and
Figure 12 . Depending on the instruction selected, the specified Register
contents point to a register File, Program Memory, or an Data Memory
location. When accessing Program Memory or Data Memory, Register
Pairs or Working Register Pairs hold the 16-bit addresses.
Figure 11. Indirect Register Addressing to Register File
One 8-bit
Program Memory
Address
(dst)
One Operand
Instruction
(Example)
Op Code
dst[7:0]
Destination
Register File
Register
12-bit address is
{RP[3:0], dst[7:0]}
Value used
in execution
Register
contains 8-bit
address (addr[7:0])
1
2
-b
it
addr
ess is
{R
P
[3
:0
], ad
d
r[7
:0
]}